Question about 2000 Pontiac Grand Prix

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How hard is it to replace a torque converter switch? every so often the service engine light comes on. when it does, the rpm's jump when shifting. I NEED HELP.

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The torque converter is controlled by a computer. When the service engine light comes on a code is set that could be disabling the the torque converter until the problem is gone. I would recommend scanning to see what code was set and doing further diagnosis before replacing any parts. There is a solenoid in the transmission under the side cover. It's a lot of labor to get to.

Posted on Jul 19, 2010

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Is this an automatic or manual (5 speed)? The part you are referring to is called a crank shaft sensor. The torque converter doesn not have a switch. It is internal in the tranny between the engine and the front part of the tranny.

I suggest replacing the crank shaft sensor and the cam shaft sensor. I am not sure where these are located on this vehicle - however, I have found them in most cases just behind the harmonic balancer. Be aware however that some engines were designed with internal sensors and may require the work of a mechanic to repair this.

I first suggest taking the car to a mechanic (or auto parts dealer) and have a diagnostics test performed as this will determine more accurately what the problem is, or could be.

Please let me know if you need further assistance.

carsandcomps,

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Posted on Jul 19, 2010

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2 Answers

I have been getting the code p0740 it says something about the torque converter clutch circuit. it doesn't seem to be going into over drive. dose anyone have any suggestions I can try.


On some cars, there is a TCC solenoid in the transmission which can be replaced by removing the bottom pan. In some cars this solenoid can't be accessed without major disassembly.

Jun 04, 2015 | Cars & Trucks

1 Answer

1998 jeep grand cherokee 4x4. have the p0740 code. have to start from neutral, then shifts faily well. May start fluttering and making noise, have to put back to N, then to D and once again will shift. ...


P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Mar 27, 2011 | 1998 Jeep Cherokee 4WD

1 Answer

91 honda accord between 50 and 55 it feels like the transmission shifts up and down conststantly but the rpm only moves from 2100 rpm to 2000 rpm but over or under that speed it runs fine.


Your transmission is probably jumping in and out of "torque converter lockup". The lockup is the most efficient mode because 100% of the power from the engine goes to the wheels and is not lost in the torque converter. It only goes into lockup at higher speeds, but will jump out if the computer senses it needs more power (at the higher engine RPMs) to maintain or increase your speed. I recommend either going faster or slower if this is bothering you. :-)

Feb 05, 2011 | 1991 Honda Accord

1 Answer

My car slams when put into drive. is it the idle


Yes, sounds like the idle speed is too high. If you keep driving like that, you will fry the torque converter / turbine. Since idle is computer controlled, you will have to take it for service tune up. There is one possibility that the rich, high rpm idle used for cold start is not disengaging properly after the engine warms up. Air conditioning will raise the idle speed by a couple hundred rpm, so avoid using it until you have the problem fixed. BTW.....warm engine rpm in idle, and neutral should be around 700-800. Anything over 900-1100 will result in a hard shift into 1st gear and dragging at stop lights.

Feb 16, 2010 | 2002 Chevrolet Malibu

1 Answer

Transmission jumps in and out of forward gears base on rpm checked fluid and its fine what could be the problem?


Sounds like your torque converter needs replacing. Torque converter is what makes the tranny shift "automatically" and works by engine rpm's, and it sounds like yours is plugged and getting stuck until it hits higher rpm's. HAVE IT CHECKED BY YOUR LOCAL TRANNY SPECIALIST.

Nov 01, 2009 | Ford Taurus Cars & Trucks

1 Answer

Spradic problem


Try to have the mechanic look for "downshift kickdown" service info. When you are driving and the cars computer senses a load that is beyond the limit of the present gear, the car will downshift into a lower gear to match the load.
The inbetween gear time is when the RPM rises because the gears want to change and the transmission has not caught up with the engine.
Some of this can be adjusted with the hydraulic pressure in the transmission. The torque converter supplies the pressure and the rebuilt trans needs to be matched with the torque converter.
Go back to the trans shop.

Sep 22, 2009 | 1993 Lincoln Mark VIII

1 Answer

Check engine code P0740 (torque conv clutch no rpm drop at lockup). Reset the check engine light and then took jeep on highway and it shifted through the gears normally and i could here the rpm's drop...


Low fluid pressure to the torque converter Have seen this before. I first try to flush the fluid and replace the filter fixed the problem most of the time. If that doesn't work u need a new torque converter.

Jul 16, 2009 | 1998 Jeep Cherokee

1 Answer

Jeep erradic in shifting


Check the adjustment on the brake switch. If the brake switch is not seated properly it will engage when hitting bumps and tell the tranny to come out of overdrive.

Feb 13, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Jeep erradic in shifting


I would look into replacing the VSS which is the vehicle speed sensor, it is the input that tells the transmission when to go into overdrive and the torque converter to lock up, also make sure the connector is clean and tight to the sensor, this part is located on the side of the trans where the speedo cable would go.

Nov 07, 2008 | 1996 Jeep Grand Cherokee

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